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2020 and 2016 are virtually tied for the hottest year on record. That means more powerful hurricanes, more intense wildfires, less ice and longer heat waves.
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The Trump administration has taken another step toward selling leases to drill oil in the Arctic National Wildlife Refuge.
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The U.S. government says warming ocean temperatures and melting ice have resulted in the "most unprecedented transition in history" in the Arctic, leading to extreme weather events across the globe.
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The extreme warming trend continues, and scientists fear that floating sea ice will be gone by midcentury. That will have extraordinary effects closer to home.